Now what I am trying to do is use the NOOBS preloaded SD Card for 3B+. But that is not working and it makes 3B+ stuck up with the first rainbow colour background page at boot up. I read through articles and found the issue is because of the older version of NOOBS which would not be compatible to support the upgrades in 3B+. The article with the resolution is found here - https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=212452. It says to run the below update commands using 3B.

sudo apt-get update

sudo apt-get dist-upgrade

When I tried I got stuck with an error in the second update process at 67%. Does anybody have a solution for this issue? Do let me know in the comments. Meanwhile I will continue to explore the possibilities.

Thank you for your suggestions tonygo and fvan I had kept flashing SD Card as the final option. My question is why is an update failing at the below command and particularly at 67% when trying to download a package of size 278MB? Is it my network connection? No I guess because it is working. I’ll try again today.

Apologies I could not find to do your suggestions due to work and projects. Last week, I downloaded and burned a new 16GB SD Card with Raspbian Stretch Desktop OS found in the link you have provided https://www.raspberrypi.org/downloads/raspbian/

But still there is nothing booting up. Now I get a blank screen and nothing else. But this works in older 3B board as a charm.

I looked at your original post and it looks like you got stuck just trying to update your version of Raspbian. Are you sure you were truly stalled? I've had issues running dist-upgrade where the get process takes a long time (many minutes) to acquire a package update from a repository. Probably issues in the network path.

Anyway, since you tried flashing a new image which works on a 3B but not a 3B+, I would think that you either have a bad board or bad power supply. I would guess that you used the same power supply for both boards, so you probably just have a bad 3B+ board. Have you tried measuring the power supply current into the 3B+? It will be somewhat higher than the 3B -> 400-500mA at idle.

I just received a new 3B+ from Element14 and I flashed the latest Raspbian desktop image (2018-10-09) on a 16GB SD card. It booted up with no problem.

Thank you ralphjy for the suggestions. Yes, the update stalled after 67% and I waited like an hour before I jumped into this decision. And I tried it twice.

Yes I also presume it to be a bad board. The power supply seems to be ok (in the case that I used the same for 3B) but will try to get a new adapter and check. I am going to get an adapter with current output equal to or greater than 2A. Which one do you use? Some say 0.7A works, which is the one I have now.

Now what I am trying to do is use the NOOBS preloaded SD Card for 3B+. But that is not working and it makes 3B+ stuck up with the first rainbow colour background page at boot up. I read through articles and found the issue is because of the older version of NOOBS which would not be compatible to support the upgrades in 3B+. The article with the resolution is found here - https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=212452. It says to run the below update commands using 3B.

sudo apt-get update

sudo apt-get dist-upgrade

When I tried I got stuck with an error in the second update process at 67%. Does anybody have a solution for this issue? Do let me know in the comments. Meanwhile I will continue to explore the possibilities.